A long long time ago, when the world was new and this game was still in EA I made a tool to allow for multiple single-player savegames, and multiple characters inside the same savegame (still single-player only).
Freshly updated as per 01/11/2019, though as always, do use at your own risk etc etc.
Version 0.3.2 is ready, download link here:
Version 0.3.2: Added a check/confirm box when trying to load a coop or multiplayer savegame, as the tool will not function optimally with those in mind (it’s a single-player tool first and foremost).
Version 0.3.1: Making sure the tool fails slightly more gracefully when Steam is not running. Thanks fito for the report/testing.
Version 0.3: Hopefully fixed a nagging issue causing the Toolbox to set wrong information for “active character” when multiple accounts were used on the savegame.
Download link here:
and how-to-use video (series) here:
I am mainly making this topic to have something to refer back to, since I still occasionally see people asking how to maintain multiple savegames, or to be able to “play against themselves” in singleplayer.